Vibratory screen



Sept. 9, 1941.

E. A. EBERT ETAL 2,255,047

VIBRATORY SCREEN Filed Aug. 9, 1938 2 Sheets-Sheet 1 45 27 6 4215mm? E ATTORNEYS p 1941- E. EBERT m-AL 2,255,047

VIBRATORY SCREEN Filed Aug. 9, 1938 '2 Sheets-Sheet 2 Patented Sept. 9, 1941" UNITED STATESPATENT OFFICE VIBRATORY SCREEN Edward A. Ebert and Walter H. Popp, Buffalo, N. Y.

Application August 9, 1938, Serial No. 223,821

8 Claims.

This invention relates to a vibratory screen and more particularly to a screen for separating solid material into certain definite sizes by means of a screen or screens mounted in a screen frame which is agitated by being journaled on a single eccentric shaft located at the center of gravity of the screen frame.

The principal object of the invention is to maintain the screen frame at the desired angle of tilt by an aligning mechanism which is independent of the eccentric shaft or of other driving means. A collateral object of the invention is to effect the desired alignment by asimple and inexpensive mechanism which can be absolutely counterbalanced. O ther objects of the invention and practical solutions thereof are disclosed in the following specification and in the accompanying drawings, wherein:

Fig. 1 is an oblique top plan of one form of vibratory screen in which our invention is incorporated, taken on line Fig. 2.

Fig. 2 is a fragmentary side elevation thereof, taken on line 2-2, Fig. 1.

Fig. 3 is a fragmentary, enlarged, and substantially vertical section, through said vibratory screen, taken 'on line 3-3, Fig. 2..

Fig. 4 is a side elevation, partly broken away,-

of a vibratory screen'equipped with a modified form of our invention.

Fig. 5 is a fragmentary, enlarged, transverse and substantially vertical section thereof, taken on line 5-5, Fig. 4.

Fig. 6 is a diminutive side elevation of a vibratory screen equipped with still another modified form of our invention.

Similar characters of reference indicate like parts in the several figures of the drawings.

This invention is a continuation in part of our Patent No. 2,126,031, dated August 9, 1938 and entitled Vibratory screen.

' Figs. 1-3

In this construction the base of the machine is constituted of a pair of inclined, parallel, side I beams l0 connected together by channel beam cross ties II or otherwise and further braced by means well known in the art such as gusset plates, etc. not deemed necessary here to be illustrated. Secured to the upper flanges of the inclined I beams I0 intermediately of their length are a pair of bearings l2 in which is journaled the outer or concentric ends of an eccentric shaft l3. Some distance inside of said bearings l2 the eccentric shaft is provided with. a pair of integral eccentric collars l4 upon which are journaled a pair of eccentric bearing sleeves 55 perfectly balanced. The screen frame and'alltransverse '20 and 2|, upper end wall 22, shelves 23, 24

I5 preferably connected together by an eccentric tube l6. Secured by bolts |1or otherwise to said eccentric sleeves "I5 is a pair of vertical longitudinal, screen-frame, side walls l8 which, together with the upper and lower screen cloths screen supporting and cross braces 25, 26, 21, 28 and 29, constitute the screen frame B, which is gyrated by the-eccentric shaft |3-and receives and segregates the material to be screened.

Extending upwardly and inwardly from each inclined I beam ||l on opposite sides of its companion eccentric shaft bearing I2 is a pair of bearing brackets 30 in which are jou'rnaled the trunnion bearings 3|, 32 of an outer universal joint ring 33, the axis of said trunnion bearings lying in a vertical, longitudinal plane parallel with the I beams |D of the base. This outer univer'salfjoint ring 33 is pivoted at its upper and lower ends at 34, 35'to an annular nutating, connecting member 36. Inwardly of the pivots 34, 35 said connecting member 36 is pivoted by vertical trunnion bearings '31, 38 to an inner, universal joint ring 46 which is provided with outstretched arms 4|, 42 journaled at their extreme outer ends on trunnion bearings, 43, 44 to the screen frame.

This construction is in effect a dual universal joint, the outer universal joint comprising the outer universal joint ring 33 with its trunnion base pivots 3|, 32 and the nutating connecting member 36 with its outer trunnion pivots 34, 35. said nutating connecting member 36 with its inner trunnion pivots 3T, 38 and the inner universal joint ring 4|) with its arms 4|, 42"

This dual uniequal angular velocity to all parts of the screen' frame as it gyrated about the concentric axis of the eccentric shaft I3. However, the combination of two universal joints constituting a dual universal joint and arranged with its pivots as shown does enable the screen frame to gyrate translationally and at the same time prevents any movement of the screen frame which is no purely translational.

The use of a pair of dual universal joints at opposite ends of the eccentric shaft l3 enables all of, their kinetic and momentum forces to be.

The inner universal joint comprises on the eccentric parts that move with balanced by the adjustable which are secured to the web of in the manner disclosed in our Patent No. 2,126,031.

Figs. 4-5

In this construction all pivots in the aligning mechanism are entirely eliminated. Arranged on the upper face of each side channel beam it of the base on opposite sides of the eccentric shaft 13' is a pair of upstanding brackets 30 to the-upper ends of each of which is secured a pair of outer, flexible links 41, ll by means of cap screws 50,1! or their equivalent. The outer ends of all of said outer links are secured by cap screws 52, 53 to the upper and lower portions of a connecting member 38' which may be either annular, as shown, or upper and lower portions of said connecting it may be perfectly counterweights 45 the flywheel 48 member 36 by means of cap screws 54, 55 or their equivalent are two pairs of inner flexible links 58, 51. The opposite ends of said pairs of inner flexible links 56, 51 are secured by means of cap screws 58, 59 to the screen frame B.

Fig. 5 illustrates er and inner flexible links l1, 48, 56 and 51 enables the dual universal joint to function properly without the need of any bearings.

Fig. 6

This construction is similar to that of Figs. 4-5

except that the annular connecting member 36' has been replaced by a single form of yoke 58 (suitably cut away centrally at Gil to clear the eccentric shaft 13") and that the connections 58" and 59" have been moved far enough out so that each cantilevered half of the screen frame is supported at its percussion point in the manner as that shown in the construction of Figs. 1 and 2, and as describedin detail in our United States Patent No. 2,126,031.

We claim as our invention;

1. A vibratory screen comprising: a base; a screen frame; means for gyrating said frame relatively to said base about a fixed axis; and a pair of universal joints connected together in series, the outer end of said pair of universal joints being connected with the base substantially concentric'with aforesaid fixed axis of gyration, and the inner end of said pair of universal joints being connected with the frame.

2. A vibratory screen comprising: a base; an eccentric shaft having its concentric portion journaled on said base; a screen frame journaled on the eccentric portion of said eccentric shaft; and a pair of universal joints connected together in series, the one end of said pair of universal joints being connected to the base substantially concentric with the concentric axis of the eccentric shaft, and the other end of said pair of universal joints being connected with the screen frame.

3. A vibratory screen comprising: a base; an eccentric shaft having its concentric portion joumaled on said base; a screen frame journaled portion of said eccentric shaft; and a pair of universal'joints connected together in series, the one end of said pair of universal joints being connected to the base substantially concentric with the concentric axis of the eccentric shaft, and the other end of said pair of universal joints being connected with the screen frame substantially concentric with the eccentric axis of the eccentric shaft.

United States otherwise. Secured to the how the flexibility of the out- ,to said axis; a

tating ring surrounding said axis and having its plane of nutation substantially perpendicular pair of stationary members arranged on said base on opposite sides of aforesaid axis and lying in a plane substantially perpendicular to said axis; outer movable members connecting said stationary members with the nutating ring; a pair of screen frame members arranged on the screen frame in a plane substantially perpendicular to aforesaid axis; and inner movable members connecting said screen frame members with the nutating ring.

5. A vibratory screen comprising: a base; a screen frame; means for gyrating said frame relatively to said base about a fixed axis; a nutating ring surrounding said axis and having its plane of nutation substantially perpendicular tosaid axis; a pair of stationary members arranged on said base on opposite sides of aforesaid axis and lying in a plane substantially perpendicular to said axis; outer movable members connecting said stationary members with the nutating ring; a pair of screen frame members arranged on the screen frame on opposite sides of aforesaid axis and lying in a plane substantially perpendicular to said axis; and inner movable members connecting said screen frame members with the nutating ring.

6. A vibratory screen comprising: a base; an eccentric shaft having its concentric portion journaled on said base; a screen frame journalled on the eccentric portion of said eccentric shaft; a nutating ring surrounding said eccentric shaft and having a plane of nutation which is substantially perpendicular to the axis of the eccentric shaft; a pair of stationary members arranged on said base on opposite sides of the concentric portion of said eccentric shaft and lying in a plane which is substantially perpendicular to the axis of said eccentric shaft;

outer movable members connecting the nutating ring with said stationary members; a pair of screen frame members arranged on the screen frame; and inner movable members connecting the nutating ring with said screen frame members.

7. A vibratory screen comprising: a base; an eccentric shaft having its concentric portion joumaled on said base; a screen frame journaled on the eccentric portion of said eccentric shaft; a nutating ring surrounding said eccentric shaft and having a plane of nutation which is substantially perpendicular to the axis of the eccentric shaft; a pair of stationary members arranged on said base on opposite sides of the' concentric portion of said eccentric shaft and 1ying in a plane which is perpendicular to the axis of said eccentric shaft; outer movable members connecting the nutating ring with said stationary members; a pair of screen frame members arranged on the screen frame on opposite sides of the eccentric portion of said eccentrieshaft; and inner movable members disposed substantially parallel to the-nutating ring and connecting said nutating ring with said screen frame members.

8. A vibratory screen comprising: a base; an eccentric shaft having its concentric portion journaled on said base; a screen frame journaled on the eccentric portion of said eccentric shaft; a nutating ring surrounding said eccenagar-5,047 3 tric shaft and having a plane of nutation which is substantially perpendicular to the axis of the eccentric shaft; a pair of stationary members arranged on said base on opposite sides of the concentric portion of said eccentric shaft and lying in a plane which is perpendicular tothe axis of said eccentric shaft; outer movable members connecting the nutating ring with said stationary members; a pair of screen frame members arranged on the screen frame on opposite sides of the eccentric portion of said eccentric shaft; and inner movable members disposed substantially parallel to the nutating ring and connecting said nutating ring with said screen frame members, the connections between said screen frame members and said nutating ring lying in a plane which intersects the connections between 

